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developerWorks: Make PHP Apps Fast, Faster, Fastest, Part 2

"Part 1 of this 'Make PHP apps fast, faster, fastest' series
demonstrates how you can accelerate your entire site using XCache,
a PHP opcode cache. XCache (just one of several caching packages
you can evaluate) retains the output of the compilation process,
eliminating otherwise redundant work. As long as a page doesn't
change, the cached version of the page suffices as proxy. When a
page is revised, the cached version is invalidated and
replaced.

"An opcode cache--and an opcode optimizer, which is often
provided in the same package--is a dirt-cheap technique to hasten
the responsiveness of your site. Many cache packages are free and
open source, and you need not change any code to realize the
benefits..."